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Table 4 HPLC analysis of phenolic compounds in CBW experiments

From: Energetic and biochemical valorization of cork boiling wastewater by anaerobic digestion

Phenolic compound (μg mL-1) CBW AD0 AD3 AD6
Gallic acid 19.50 ± 3.71 4.17 ± 0.26 15.47 ± 4.08 22.43 ± 3.97
Protocatechuic acid 8.50 ± 1.02 0.64 ± 0.09 5.07 ± 1.59 9.82 ± 1.33
Caffeic acid 2.14 ± 0.15 0.59 ± 0.44 1.15 ± 0.21 1.77 ± 0.36
Vanillic acid 2.00 ± 0.19 tr 1.15 ± 0.37 1.91 ± 0.36
Syringic acid tr nd tr 1.10 ± 0.99
Ellagic acid 96.50 ± 11.50 2.49 ± 0.39 22.3 ± 3.48 41.80 ± 8.49
p-Coumaric acid 4.10 ± 0.26 1.10 ± 0.18 1.77 ± 0.28 2.47 ± 0.40
Ferulic acid 6.50 ± 0.78 1.02 ± 0.08 1.55 ± 0.37 5.60 ± 0.98
o-Coumaric acid 3.80 ± 0.29 tr 1.17 ± 0.32 4.51 ± 0.33
trans-Cinnamic acid 3.70 ± 0.37 2.16 ± 0.26 2.10 ± 0.29 3.13 ± 0.63
  1. Values presented as an average ± standard deviation. AD0, blank anaerobic digestion assay; AD3, anaerobic digestion assay at 3 kg COD m-3 of CBW; AD6, anaerobic digestion assay at 6 kg COD m-3 of CBW; CBW, cork boiling wastewater, reactor influent; HPLC, high performance liquid chromatography; nd, not detected; tr, traces.